Safety paper



Patented Dec. e, 1927.

Application mea Haren 12,

This invention relates to improvements in safety paper and to a method for the manufacture of the sa1ne,'and more particularly to safety paper forr checks, bonds, notes and 5 other negotiable and documentary paper.

The present invention 'has for 1ts primary object the provision of a safety paper which is extremely sensitive to eradicating or bleaching substances or compounds applied tothe paper in any manner, whereby such application results in ready and speedy discernment.

It is a further object. of the present invention to provide a safety' paper of the above character which is extremely sensitive to eradicatin `or bleaching solutions or com-- pounds applied to the paper as a tracing over matter written or otherwise appearing Athereon or applied for general eradication of matter appearing `on the paper, and which thus offers protection against attempts to alter such matter appearing on the paper. f

A further object is to provide in a safety paper a means to prevent alteration or removal'of matter writtenor otherwise appearing` thereon by the 'ap lication" ofy an eradicating compound or su stance.

A further object is to provide a safetyr -paper having normally invisible properties therein, whichare rendered visible upon the application of an eradicating 'agent to thereby indicate an 'attempt to alter matter printed, written or'otherwise appearing on the aper, whichi.properties arenot discernible fore the attempt at alteration and which are retained indefinitely in the p a er.

A further object is' to provide in--a sa ety `paper a means of detection of fraudulent alteration, which means may be inexpensively applied4 to the paper at any stage of its manufacture with equal eiciency 4and utility resulting therefrom..

A further object is "to provide an improved method of manufacturing a safety paper which is extremely sensitive toeradieating or bleaching compounds, solutions or substances, to thereby protect the 'user o the paperfrom attempts at f raudulentalte ations of the paperby the application of such eradicating compounds or solutions.

Other objects will be in part obvious from] the annexed drawing and'in part indiated from the following 'analysis lof the inven- PATENTl OFFICE.

EASTON, PENNSYLVANIA.

PAPER.

1927. smal no. 174,957.

tion, in which reference is made to the accompanying drawings illustrating one embodiment of my idea.

In the drawings- Fig. 1 represents a negotiable paper, such as a check, protected in accordance with my mvention.

Fig. 2 represents the check shown in Fig.

1 after the application of van eradicating agent for alteration purposes.

My invention consists broadly in applying to the ,paper to be protected in any ap.

proved manner, as by subjecting the paper to a bath, a coating of a chemical solution which is colorless upon application to the paper; and thereafter, 'while the paper is wet, impressing or accentuating thereon with a printing roller or the like, suitable warning indicia such as the words tVoid. IContact between the impression surface of the roller and the paper wet with the clemi- -cal solution, causes the solution to be pressed more densely on the surface of the paper engaged by the impression surface than on the surface ofthe paper not contacted with by said impression surfaces. Both the coating of the solution applied to the -paper and the impressed'warning indicia formed therewith are normally invisible. Uponthe application of a chemical designed for alteration purposes, such as the so-called ink eradicator, a chemical reaction is set up which causes a cha ge of color of the paper affected thereby, he warning indicia appearing in a relatively darker color' by reason of. its more dense application to the paper'caused by contact with the impression surface of the roller, while theparts of the paper not. affected by the'pressure of said roll, altho subjected to the bath, and forming a background vfor the warning indicia,

appear in al relatively lighter color, but of v,suiiicient depth to bereadily distinguished from the normal or unchanged color of the paper.v The warning indicia is thus readily discernible against a field of relatively lighter color, and both thel indicia and its field or background are rendered visible` upon the application of an eradicating agent..

cableafimpression or change of appearance in cation. Serial No. 171,269, tiled February 26,

1927, I have described a satisfactory solution for the above purpose, namely, a colorless aniline solution, such as an andino-chloride 'compound (CCHSNHBHCL) or, as more just previously applied to the paper.

. pressure of the impression surfaces of the commonly designated, aniline-chloride or a-niline salt. To the end that this solution is" rendered stable and lasting when applied to the paper, I propose to make the solution slightly acid bv adding thereto a. small quan'- tity of a suitable acid, such as citric, lactic, ,or stearic acid. The proportions of the chemicals making up this solution are unimportant so long as the paper is thoroughly coated or impressed therewith.

In the drawings, numeral-5 represents a safety paper, such as a check, to winch has been applied as by a' bath process, a coating of a colorless chemical solution, such as the aniline chloride compound liereinbefore noted. rIhe paper while still wet has been brought 'in contact.` with a printing or dandy roll having an impression surface thereon adapted to impress suitable warning indicia, such as the words Void throughout the paper and with the solutpln roll on the wet paper causes the solution to be more densely applied to the contacted surface of the paper than to the restof the paper in such a manner as to be readily seen, if the aper were subjected to an ink eradicating fluid, against the field or background resulting from the coating or bath of the paper. The numeral character 6 designates the field lor background for suitable warning indicia, such as the words Void indicated at 7, and impressed thereon by a printing or dandy roll or the like, the dotted lines indicating that the indicia and its field are normally invisible. The printing surface of the roll, if desired, might be inked with the colorless chemical solution which -in effect would superimpose the warning indicia on the coating applied to the paper with the solution as above described. Y Slmilarly, the pressure of the impression surface of the roll may be regulated, andk may impress` the warning indicia into the body of the paper without unduly destroying the finisl" of the paper. The solution and/or the warning indicia may be` applied throughout the whole surface of the paper or may be applied to only those parts of the paper upon which is written or otherwise impressed' matter subject to alteration. i

vbrown color.

In Fig. 2, I have illustrated the result of an attempt at alteration, and it will be assumed that an eradicating agent such as an ink eradicator has been applied to the cheek for the purpose of alteration or removal of matter written thereon. The eradicating fluid causes with the applied coating a chemical reaction which produces Awhat is commonly known as aniline black.

The `impressed or accentuated warning indicia. by reason of the more thorough impregnation of the solution on.the paper caused b v Contact with the impression surface of the dandy roll, appears'in a pro nounced black or dark brown color, as in dicated at 8. against the field or background 9 which has similarly changed in color but to fa lighter shade of brown. |Ihe word or words Void are rendered clearly discernible against the lighter 4background and serve to nullify the paper. The aniline black, being once established and brought out in .the paper, can be removed or destroyed only by boiling the paper in sul-v phuric acid which would, of course, destroy the paper. y

Where an attempt is made' to remove matter written or otherwise appearing on the check, such as the payees name or the amount of the check, by tracing this matter with an eradicating fiuid, there resultsy the chemical reaction above noted .with the applied invisible field or the invisibly impressed warning indicia, and the written matter traced over appears in black or The matter sought to be removed is consequently brought out in permanent and inera'dicable form. v

The addition of the citric or other named acids is not essential to my invention, but adds to the stability of the aniline-chloride' compound on the paper when exposed to air or other elements for a long time. So, also. I do not wish to be limited to the use of aniline-ehloride applied to the paper, as any colorless aniline solution, or anyother chemical solution which, upon the application of eradicators, -would produce an ineradicable impression, would function as efficiently. A fugitive tint design may be applied as desired over the paper in order` to provide a means of detecting frictional erasures by rubber,`knife. or the like.

It is seen from the above that my improved safety paper'and the method of producing the same presents many advantages over types and manufacture of safety paper now in use. The inventionv can be applied to any kind of paper with equal facillty, as no special paper is needed, and, when applied, cannot discerned. Paper protected" in accordance with the above disclosure offers ahi h degree of protection pgainst removal an /or alteration of matter printed, written or otherwise appearing on the paper.

lll"

lac i In manufacture and preparation, it is ev'idicia, instead of the designs commonly used` and the impressionmade on the paper j'normally invisible instead ot normally visible as the fugitive t-ints would appear. The

4 above described process, however, does not and could even necessarily obviate the application of a .visi-v ble fugitive tint design to my safety paper, as the fugitive tint may be applied to take care of frictional erasures with rubber, knife, glass pencil, or the like. No new types of machinery are, therefore, necessary. The aniline solution can be applied at any time during the preparation of the paper, be applied to a finished paper' without injuryor discernment of the same.

It will be seen that the several objects' of the invention are achieved and other advan-n tageous results attained. As many changes could be made in carr 'ng out the aboveinvention, it is intende that all matter conL tained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. The method making safety paper which consists in ap ying to the paper a' colorless chemicalso ution which is visibly reactive to bleaching yor eradicating agents and accentuating warning indicia'v on said paper with said-solution while the paper is wet' with said solution, rwhich warning indicia, if discernible, would inherently nullify paper. 2. The method of making safety paper which consists in applyingto the paper a flilorless chemicalsalt solution which is visiv y i reactive to bleaching or eradicating agents and impressing or aceentuating warninlg; indicia on said paper with said solution le the paper is wet with said solution, which warning indicia, if discernible, would inherently nullify th pa er.

3. The method o .ma ing safety paper which consists .'i'n applying to the paper a colorless aniline salt solutiony which is visibly reactive to -bleachingjor eradicating agents and impressin warning indicia on said paper with sai solution'while the.

paper is wetwith said solution, which warn-` which consists ing indicia, if discernible, nullifythepaper. v

l4. The method of making safety paper in applyingto the paper a would inherently all safety compound colorless aniline compound which is ,visiblyreactive to eradicating or bleaching agent/s and impressingor accentuating warning in-r by the addition of a small quantity of acid to said solution.

6. A- safety paper having applied thereto a colorless chemical compound which is visibly reactive Vto eradicating agents, and warning ind'cia impressed on the paper with said compound, the applied -compound adapted to form a. visible background on the paper for the impressed indicia.

7. YA sa tety paper having applied thereto a lcolorless chemical salt compound which is visibly reactive to eradicating or bleaching agents, and warning indicia im ressed on the paper with said compound, t 'e applied compound adapted to form a visible background on the paper for the impressed inicia.

8. A safety paper having applied thereto a colorless aniline salt compound which is visibly reactive to eradicating or bleaching the paper with said compound, t e ap lied 1 warning indicia on said paperA compound adapted to form a visible ackound for the impressed indicia.

9. A safety paper having applied thereto a colorless aniline chloride compound which is visibly reactive to eradicating or bleaching.l agents, andwarning indicia im on the paper with vlied compound adapted to form a visib e background for the impressed indicia.-

10. A safety paper having applied thereto a colorless chemical compound which is .slightly acid and visibly reactive to eradicating agents, and warning indicia impressed on the paper with said compound, the .a lied compound adapted .to form a vislb e lbackground for the impressed indicia..

ressed said-compound, t e a lll 11. A safety paperhaving applied thereto a f colorlesschemical comp iblyk agents, the paper with said compound, t

V adapted to ound which is reactive to bleaching or eradicatmg'. .and warning indicia implressed onf-j.,

e ap lied. form avisible ack-" ground against `whichtheimpressed l,

are discernible. Y

' 12. `A safety paper back-ff having applied a colorless chemical salt compound which is' s ground against which are discernible.

13. A safety paper having applied thereto a colorless aniline salt compound which is visibly reactive to bleaching or eradicating agents, and Warning indicia impressed on the paper with said compound, the Vapplied' compound adapted to form a visible background against which the impressed indicia are discernible.

14. A safety paper having applied thereto a colorless anilinc chloride compound which is visibly reactive to bleachingor eradicating agents, and warning indicia impressed' on the paper with said compound, the aplied compound adapted to .form a visible ackground against dicia are discernible.

15. A safety paper having applied thereto a. colorless chemical compound which is slightly acidic and reactive to bleaching or eradicating agents, and Warning indicia impressed on the paper with said compound,

the impressed indicia which the impressed in' the applied compoundl adapted to form a visible background against which the impressed indicia are discernible.

16. The method of making safety paper which consists in applying to the paper a colorless chemical solution which is visibly. reactive to bleaching or eradicating agents, and impressing Warning indicia on said paper with said solution, which indicia, if discernible, would inherently nullify the paper. v

17. The method of making safety paper which consists in applying to the apex a colorless chemical salt solution wiich is visibly reactive to bleaching or eradicating agents, and impressing warning indicia on said paper with said solution, which indicia, it discernible, would inherently nullify the paper.

Signed at Easton, day of March, 1927.

J. WALLACE NEFF.

Pennsylvania, this 7 th 

